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42-49-day month calendars

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Months have either 6 or 7 normal weeks, i.e. 42 or 49 days. Patterns are usually alternating, i.e. 49:42 = 7:6 and 42:49 = 6:7, but can be totally irregular (similar to ISO weeks in the Gregorian calendar).

Four times 49 + 42 = 91 makes 364 days, thus a leap week has to be introduced which may make one month irregularly 7 weeks = 49 days or 8 weeks = 56 days long in leap years.

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